Physics
The splitting of different colours of light in a prism is :

Disperson of light
Reflection of light
Refraction of light
Diffraction of light

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Physics
In a bipolar junction transistor

All the three regions (the emitter, the base and the collector) have equal concentrations of impurity
The base has the least concentration of impurity
The collector has the least concentration of impurity
The emitter has the least concentration of impurity

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